My Scottish accent is no doubt my best.
Currently working on Northern British too. Mother = Meuthah
My Russian accent's also pretty good.
And I have to do an Italian accent for this year's school play. It's going pretty well, being that I learned it from AC2.
My roosterney accent is good too, though everyone can do a roosterney accent.
And I can do a pretty good "gruff burly viking" voice, like some of the guards in Skyrim. "HEURD DERE REFAWRMING DE DAWNGAWHD. VAMPIAH HUNTEAHZ OR SOMPSING, IN DE OLD FOART NEAR REEFTIN. MAIGHT CONSIDAH JOYNING UP MAHSELF."